Electrical Machine Teeth With Parallel Side Walls
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Solution Overview
Problem
Conventional electrical machines suffer from inefficiencies due to air gaps between windings and the circumferential side walls of teeth, which result in non-constant slot widths and increased winding resistance and copper loss.
Innovation Solution
A tubular body design with teeth having parallel circumferential side walls, allowing for constant slot widths and reduced air gaps, enabling full utilization of the slot area and improved winding alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional teeth with constant width are used, then manufacturing is simplified, but air gaps form between windings and tooth side walls reducing efficiency
Solution Approach 1:
The tooth structure is divided into different sections with different properties: the first section has a first width while the second section has a second width that is smaller than the first width. This local variation in dimensions allows the slot opening width to differ from the slot bottom width, enabling windings to abut smoothly against the tooth side wall across the entire radial extent, thereby eliminating air gaps and reducing copper loss.
2Device complexity
If conventional teeth with constant width are used, then device complexity is reduced, but slot area utilization is inefficient
Solution Approach 1:
The tooth is designed with non-uniform width along the radial direction, creating a trapezoidal cross-section rather than a rectangular one. The first section extends further radially than the second section, which allows the slot to accommodate windings more effectively across different radial positions, maximizing the utilization of available slot area while maintaining relatively simple manufacturing processes.
3Device complexity
If conventional teeth with constant width are used, then structural simplicity is maintained, but winding alignment is compromised
Solution Approach 1:
By varying the tooth width locally along the radial direction, the slot geometry is optimized to match the rectangular cross-section of the windings. The first section provides adequate space at the slot opening while the second section ensures proper alignment at the slot bottom, enabling the windings to be precisely aligned and abut against the tooth side wall without requiring complex manufacturing processes.
Data Source
AI summary
A tubular body for an electrical machine is provided. The tubular body comprises a curved surface area, a first tooth and a second tooth. The tubular body is arrangable with respect to a further tubular body such that one of the tubular body or the further tubular body is rotatable with respect to the other one around a rotary axis. The first tooth and the second tooth extend from the curved surface area along a radial direction with respect to the rotary axis. The first tooth comprises a first side wall facing a second side wall of the second tooth, wherein the first side wall comprises a first section which is parallel to the second side wall such that a circumferential distance between the first section and the second side wall is constant along the radial direction.